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Chin. Phys. B, 2022, Vol. 31(4): 047301    DOI: 10.1088/1674-1056/ac2b94

Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

Xingfei Zhou(周兴飞)1,†, Ziying Wu(吴子瀛)2, Yuchen Bai(白宇晨)1, Qicheng Wang(王起程)1, Zhentao Zhu(朱震涛)1, Wei Yan(闫巍)1,‡, and Yafang Xu(许亚芳)2,§
1 New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
2 College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
Abstract  We investigate the electron retroreflection and the Klein tunneling across a graphene-based n-p-n junction irradiated by linearly polarized off-resonant light with the polarization along the x direction. The linearly polarized off-resonant light modifies the band structure of graphene, which leads to the anisotropy of band structure. By adjusting the linearly polarized light and the direction of n-p-n junction simultaneously, the electron retroreflection appears and the anomalous Klein tunneling, the perfect transmission at a nonzero incident angle regardless of the width and height of potential barrier, happens, which arises from the fact that the light-induced anisotropic band structure changes the relation of wavevector and velocity of electron. Our finding provides an alternative and flexible method to modulate electron retroreflection and Klein tunneling.
Keywords:  linearly polarized light      electron retroreflection      Klein tunneling      graphene  
Received:  23 August 2021      Revised:  15 September 2021      Accepted manuscript online:  30 September 2021
PACS:  73.22.Pr (Electronic structure of graphene)  
  73.20.At (Surface states, band structure, electron density of states)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11804167, 11804291, and 11904175), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20180739, BK20180740, and BK20180890), the Innovation Research Project of Jiangsu Province, China (Grant No. CZ0070619002), NJUPT-SF (Grant Nos. NY218128 and NY218135), and NJUPT-STITP (Grant No. XYB2020301).
Corresponding Authors:  Xingfei Zhou, Wei Yan, Yafang Xu     E-mail:;;

Cite this article: 

Xingfei Zhou(周兴飞), Ziying Wu(吴子瀛), Yuchen Bai(白宇晨), Qicheng Wang(王起程), Zhentao Zhu(朱震涛), Wei Yan(闫巍), and Yafang Xu(许亚芳) Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction 2022 Chin. Phys. B 31 047301

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